Mulch ado about nothing
A selling point for blower vacs over leaf blowers is their ability to mulch collected leaves, which reduces the volume of waste. The mulch can then be spread on your garden to improve soil health. Many manufacturers claim “mulch ratios” upwards of 10:1 (i.e. 10 bags of loose leaves reduce to one bag of fine mulch). But take these claims with a grain of salt – in previous tests we found the ratios to be closer to 4:1, especially with densely packed or wet debris.
Look for models with a metal impeller (fan) rather than plastic – they’re more effective at chopping up leaves and thereby reducing the volume of waste, and they’re more durable. Some models feature “mulching knives” on the impeller to aid in chopping up the material.